This paper focuses on the interactive sources of flowing sentences and examines the conditions of the integration of dialogues into following sentences.It points out that dialogues are dual-perspective discourse,while flowing sentences are single-perspective discourse.The process of dialogues'integrating into flowing sentences needs the completion of transformation from dual to single perspective.Whether dialogues can be integrated into flowing sentences depends on whether the opposite perspective can be resolved.The perspective oppositions that are difficult to resolve directly are reference opposition,attitude opposition and behavior opposition.The paper finally finds the continuity of discourse transformation in the process through testing,i.e.,quoted discourse>hypothetical discourse>direct narrative discourse.